Malicious PDF — malware analysis report

Static analysis result for SHA-256 412490cca2fba826…

MALICIOUS

PDF

73.0 KB Created: 2021-03-28 20:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a813726eedffff8c1f41142c83140444 SHA-1: 1d6e0df44599eacc34d43d693d2b3ca25434e652 SHA-256: 412490cca2fba82608b1be5a64cf6e1b09ad66d52beb2df7b6e6285fdf2a0f1f
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xezojetit.ru/award?keyword=pdf+to+word+converter+small+size+online PDF link annotation
    • https://cdn.sqhk.co/pafevola/hgDggji/tunein_free_music.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/what_fruits_are_high_in_complex_carbohydrates.pdfIn PDF document text
    • https://cdn.sqhk.co/mivesavif/wij6hex/2832847220.pdfIn PDF document text
    • http://jefevivavifax.scienceontheweb.net/breast_cancer_awareness_month.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/ibiau2O/53009915988.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/7Bae3YD/qr_code_scanning_on_iphone_11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454304/normal_605ca43a168c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453885/normal_601b371e45474.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375889/normal_5feb69cd353f1.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/hgjgLZu/spiral_staircase_band_youtube.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0ffdd24b-620b-4f4d-94ef-a39da1ca20bd.filesusr.com/ugd/853ce2_e74670466ae44ad68032817f7907d5a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/187bd756-3c9c-41b1-a553-f05793ae5b68/a_suitable_boy_netflix_guardian_review.pdfIn PDF document text
    • http://piwolimosopobu.myartsonline.com/track_and_field_events_file.pdfIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_d00a35b0993647808d0a3d6794bf0499.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b794360-4ed2-40c9-84b9-33dcf68fc4d8/zumalebitepojamizofodel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0288d64d-ad17-487b-a47a-eb975d6745d3/software_architecture_document_template_ieee.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/nanostation_loco_m2_firmware_6.1.6_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/padudomajes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9255ebdc-2481-42cc-b161-6499f0fafbec/wisemi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE23 5368 bytes
SHA-256: 6b05c3d01028db3c5e69b9e01177f7311f682aa1b2416e7acdeb8521f1ef3525
font_01_sfnt_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 11248 bytes
SHA-256: 035b0b7c37aeb146a7d9993e50970830eea3a6b146ff771953c0229406e71f65